It was gratitude; gratitude, not merely for having once loved her, but for loving her still well enough to forgive all the petulance and acrimony of her manner in rejecting him, and all the unjust accusations accompanying her rejection.
There are no more uses of "acrimony" in the book.
Show samples from other sources
The meeting ended in acrimony.
It is wrong to waste the precious gift of time, on acrimony and division.